If you're talking about someone you love, I know a very easy way.
fall in love again, but with someone else. Unfortunately, it is very difficult to forget the money you lost or the gain you want to forget.

Yeah
If you genuinely love the partner and she doesn't love back, just let her go and be happy. Perhaps this behavior could convince her you truely care. In True love, it's about the other person before yourself. you could try and get her to reciprocate the love by treating you as brother... And no inappropriate touching or feelings. Just building up each with good things of life.